2. A mutation is any change in the DNA of a gene.

Biology

2 answers:

ArbitrLikvidat [17]2 years ago

7 0

A. The loss of one or more chromosomes

givi [52]2 years ago

3 0

D) a change in protein synthesis

You might be interested in

Suppose you were in charge of sending an unmanned space probe to a new planet in search of life. The probe would be able to coll

Svetlanka [38]

Answer:

Option D, a test for the presence of cells that contain DNA

Explanation:

As we know all living organisms are made up of cells and DNA is the basic genetic material that codes for protein and traits with an organism. If even a single cell with DNA is detected on the extraterrestrial planet then it will be clear that it has life on it or the environmental conditions are favorable to support life. Cells are microscopic and hence can be seen through microscope which can be installed easily on a probe.

Hence, option D is correct

8 0

3 years ago

A signaling pathway that stimulates cellular growth and division is positively regulated by a GTPase encoded by an autosomally l

Romashka-Z-Leto [24]

Answer:

The correct answer is: a.

Explanation:

A Diploid organism possess two copies ( also called alleles) of each autosomal gene, of which one copy of the gene is obtained from one of its parents and the other copy from its other parent.
During the process of replication, one of the alleles of the GTPase encoding gene undergoes a mis-sense mutation.
A Mis-sense mutation can be defined as a non-synonymous mutation in which one of the nucleotide in the sequence of the gene gets altered such that it causes a change in the amino acid encoded by the codon (triplet nucleotide message encoding for a single amino acid) formed by the mutated nucleotide. A single amino acid change in the protein, if occurs in the functional site of the protein, can render a protein non-functional.
Hence, the mis-sense mutation in one of the alleles encoding for the GTPase gene causes the resulting protein produced from the mutated allele to have drastically reduced function (1%).
A heterozygous cell is one which has one copy of the normal allele and the other copy of the mutated allele of the GTPase encoding gene.
As one copy of the normal GTPase allele is present in such an individual, it can produce the normal GTPase protein that can assist in the process of cell growth and division.
Hence, the phenotype(expressed character) of the heterozygous cell will not be affected due to the mutation and it will be able to grow and divide normally.